Steam boiler



2 SheetsShet' 1. R. JOY.

STEAM BOILER.

(No Model.)

Patented Apr. 25,1893.

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R. JOY. STLAM BOILER.

No. 495,977. Patented Apr. 25, 1893.

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ERS co. PHDYO-LITND.,WASNINGTON u c UNITED STATES ROBERT JOY, OF OSWEGO, NEYV YORK, ASSIGNOR TO THOMSON KINGSFORD,

PATENT Ornrcri.

OF SAME PLACE.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 495,977, dated April 25, 1893.

Application filed January 31, 1 8 9 3 To all whom it may concern:

Be it known that I, ROBERT JOY, of Oswego, in the county of Oswego, in the State of New York, have invented new and useful Improvements in Steam-Boilers, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to the class of return flue boilers in which the front end portion of the boiler-shell proper is of cylindrical form and the rear portion is vertically elongated and has the direct flues extending through it and connected to the fire-box formed directly under the cylindrical front portion of the shell. And the invention consists in a novel construction and combination of the component parts of the boiler-shell and fire box shell which latter is surrounded by a water leg and thus materially increases the heating surface of the boiler, as hereinafter more fully described and specifically set forth in the claim.

In the annexed drawings Figure 1 is a ver tical longitudinal section of a steam-boiler embodying my improvements. Fig. 2 is a vertical transverse section on line as, at, in Fig. 1. Fig. 3 is a perspective view of the component parts of the boiler shell proper. Fig. 4 is a detached perspective view of one of the inner side plates of the fire-box, and Fig. 5 is a detached perspective view of the direct flue-sheet which forms the inner rear wall of the fire-box.

Similar letters of reference indicate corresponding parts.

The boiler-shell proper I form of the cylindrical front portion -A and semi cylindrical rearward extension A'- which is a continuation of the upper half of the cylindrical portion as shown in Fig. 3 of the drawings, which also shows the section which forms the bottom and sides of the rear end portion of the boiler shell, and consists of the inverted semi-cylindrical bottom plate ]3- formed with the vertical extensions B'B at the top edges of which latter it is riveted to the bottom edges of the semi-cylindrical top portion ---A'.

To the front of the cylindrical portion A- is riveted the front flue sheet -P- which is $erial No. 460,411. (No model.)

vertically elongated and extends beneath the plane of the bottom of the rear portionB as shown in Fig. 10f the drawings. The rear flue-sheet -H is secured to the interior of the boiler shell a proper distance from the rear end thereof to form the smoke-boxL-. To the front end of the rear portion -B B B is riveted the vertical plate P- the bottom edge of which is on a level with the bottom of the front plate P. To opposite sides of the cylindrical front portion A are riveted the vertical side plates OO which extend directly and tangentially from said shell and terminate in the same plane with bottoms of the plates P-P. The said side plates together with the plate P- and lower portion of the plate P form the outer walls of the fire box R which is surrounded by a waterleg formed of the inner front plate D attached to the bottom portion of the cylindrical shell A- and arranged with a water space a between it and the front plate P. The inner rear plate E which constitutes the front direct flue sheet, is also attached to the bottom portion of the cylindrical shell A and arranged with the water space -a between it and the plate P'. The inner side-plates -FF are preferably bent inward at their upper ends as shown at bin Figs. 2 and 4 of the drawings so as to form small arches over the sides of the fire-box. Thelongitudinal edges of said bent or arched portions of the side plates are riveted to the under side of the cylindrical portion A which forms the crown sheet of the fire-box. Said inner side plates are also disposed with the water space --a between them and the outer side plates -O-O. The bottom edges of the described inner plates of the fire-box are all flanged outward and riveted to the bottom edges of the outer plates --PP and O-C.

The efficiency of the boiler may be augmented by the pipe I which is located in the smoke-box -L and taps the boiler head preferably between the direct fines cand return fiues dto avoid the entrance of sediments into said pipe. The pipe is extended in a tortuous course through the interior of the smoke-box and thence into the upper part of the boiler shell as shown in Fig. 1 of the drawings. The pipe forms an additlonal water space which is heated by the products of combustion entering the smokebox and impinging the pipe.

I Iaving described my invention, What I clalm as new, and desire to secure by Letters Patent, is'

Inareturn flue boiler of the class described, the combination with the cylindrical shell A formed with the semi cylindrical rearward top-extension A', the inverted semicylindrical bottom plate B formed with the vertical extensions B riveted to the bottom edges of the extension A'-, and the plates -PP' attached to said parts as shown, of the side-plates -CC attached directly tangentially to the sides of the cylindrical shell -A-, and thejfire box-shell formed of the front-plate D attached to the cylindrical shell --A- with the water space a between it and the plate -P-, the flue sheet E also attached to the aforesaid cylindrical shellwith the water space between said sheet and plate P-, and the side-plates FF-- attached to said cylin- ROBERT JOY. [L. s.]

\Vitnesses:

EPHRAIM M. WILKINSON, B. W. BURLEIGH. 

